Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
57. Najadaceae, the Naiad Family
1. Najas L. -- Naiad
1. Najas flexilis (Willd.) Rostk. & Schmidt
Plants monoecious; stems branching, 5-30 cm long. Leaves densely
clustered at stem tips, linear, attenuate, minutely spinulose on the margins,
1-3 cm long, 0.3-0.7 mm wide. Achenes olive-green to reddish, the beak
1 mm or more long. Seeds 2.5-3 mm long, 1/3 as thick, the seed coat shiny,
very faintly reticulate, with 30-40 rows of obscure pits across the middle.
Jul--Sep. Fresh or calcareous water of lakes and ponds; uncommon and local at
scattered locations, mainly in the e and c parts; (Newf. and Que. to se Man.,
s to MD, IN, IA and NE; also B.C. and n Alta., s to ID and CA).
Return to Family -- Najadaceae - The Naiad
Next Section -- Najas guadalupensis (Spreng.)
Magnus. -- Southern naiad